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  Microsoft Security Bulletin MS10-047 - Important Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege (981852)

From:MICROSOFT <secure_(at)_microsoft.com>
Date:11.08.2010
Subject:Microsoft Security Bulletin MS10-048 - Important Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2160329)

Microsoft Security Bulletin MS10-048 - Important
Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2160329)
Published: August 10, 2010

Version: 1.0
General Information
Executive Summary

This security update resolves one publicly disclosed and four privately reported vulnerabilities in the Windows kernel-mode drivers. The most severe of these vulnerabilities could allow elevation of privilege if an attacker logs on to an affected system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.

This security update is rated Important for all supported editions of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting the manner in which Windows kernel-mode drivers handle exceptions, allocate memory, and validate system call arguments, user-mode input, and new window callback parameters. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. None
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Affected and Non-Affected Software

The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.

Affected Software
Operating System Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update

Windows XP Service Pack 3


Elevation of Privilege


Important


MS10-032

Windows XP Professional x64 Edition Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows Server 2003 Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows Server 2003 x64 Edition Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows Server 2003 with SP2 for Itanium-based Systems


Elevation of Privilege


Important


MS10-032

Windows Vista Service Pack 1 and Windows Vista Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*


Elevation of Privilege


Important


MS10-032

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*


Elevation of Privilege


Important


MS10-032

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2


Elevation of Privilege


Important


MS10-032

Windows 7 for 32-bit Systems


Elevation of Privilege


Important


MS10-032

Windows 7 for x64-based Systems


Elevation of Privilege


Important


MS10-032

Windows Server 2008 R2 for x64-based Systems*


Elevation of Privilege


Important


MS10-032

Windows Server 2008 R2 for Itanium-based Systems


Elevation of Privilege


Important


MS10-032

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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Frequently Asked Questions (FAQ) Related to This Security Update

Where are the file information details?
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.

Why does this update address several reported security vulnerabilities?
This update contains support for several vulnerabilities because the modifications that are required to address these issues are located in related files. Instead of having to install several updates that are almost the same, customers need to install this update only.

Does this update contain any security-related changes to functionality?
Yes. In addition to the changes that are listed in the "Vulnerability Details" section, this update also includes defense-in-depth measures that correct potential integer overflows in unrealistic scenarios due to memory restrictions. These defense-in-depth changes are only applicable to 64-bit systems. Even though there is no realistic way for an attacker to meet the conditions needed to exploit these issues, Microsoft is correcting the code to ensure no future issues are identified in these specific areas.

I am using an older release of the software discussed in this security bulletin. What should I do?
The affected software listed in this bulletin have been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, visit the Microsoft Support Lifecycle Web site.

It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Lifecycle Supported Service Packs.

Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, visit the Microsoft Worldwide Information Web site, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.
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Vulnerability Information

Severity Ratings and Vulnerability Identifiers

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the August bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Win32k Bounds Checking Vulnerability - CVE-2010-1887 Win32k Exception Handling Vulnerability - CVE-2010-1894 Win32k Pool Overflow Vulnerability - CVE-2010-1895 Win32k User Input Validation Vulnerability - CVE-2010-1896 Win32k Window Creation Vulnerability - CVE-2010-1897 Aggregate Severity Rating

Windows XP Service Pack 3


Moderate
Denial of Service


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows XP Professional x64 Edition Service Pack 2


Moderate
Denial of Service


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2003 Service Pack 2


Moderate
Denial of Service


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2003 x64 Edition Service Pack 2


Moderate
Denial of Service


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2003 with SP2 for Itanium-based Systems


Moderate
Denial of Service


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Vista Service Pack 1 and Windows Vista Service Pack 2


Moderate
Denial of Service


Not applicable


Not applicable


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2


Moderate
Denial of Service


Not applicable


Not applicable


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*


Moderate
Denial of Service


Not applicable


Not applicable


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*


Moderate
Denial of Service


Not applicable


Not applicable


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2


Moderate
Denial of Service


Not applicable


Not applicable


Important
Elevation of Privilege


Important
Elevation of Privilege


Important

Windows 7 for 32-bit Systems


Moderate
Denial of Service


Not applicable


Not applicable


Not applicable


Important
Elevation of Privilege


Important

Windows 7 for x64-based Systems


Moderate
Denial of Service


Not applicable


Not applicable


Not applicable


Important
Elevation of Privilege


Important

Windows Server 2008 R2 for x64-based Systems*


Moderate
Denial of Service


Not applicable


Not applicable


Not applicable


Important
Elevation of Privilege


Important

Windows Server 2008 R2 for Itanium-based Systems


Moderate
Denial of Service


Not applicable


Not applicable


Not applicable


Important
Elevation of Privilege


Important

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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Win32k Bounds Checking Vulnerability - CVE-2010-1887

A denial of service vulnerability exists in the Windows kernel-mode drivers due to the improper validation of an argument passed to a system call. An attacker could exploit the vulnerability by running a specially crafted application causing the system to become unresponsive and automatically restart.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-1887.

Mitigating Factors for Win32k Bounds Checking Vulnerability - CVE-2010-1887

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:


An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k Bounds Checking Vulnerability - CVE-2010-1887

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k Bounds Checking Vulnerability - CVE-2010-1887

What is the scope of the vulnerability?
This is a denial of service vulnerability. An attacker who exploited this vulnerability could cause the affected system to stop responding and automatically restart. Note that the denial of service vulnerability would not allow an attacker to run code or to elevate the attacker's user rights, but it could cause the affected system to stop accepting requests.

What causes the vulnerability?
The Windows kernel-mode drivers do not properly validate an argument passed to a system call.

What is the Windows kernel-mode driver (win32k.sys)?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause the affected system to stop responding.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and cause the system to stop responding.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses this vulnerability by correcting the manner in which Windows kernel-mode drivers validate the argument passed to the system call.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Win32k Exception Handling Vulnerability - CVE-2010-1894

An elevation of privilege vulnerability exists due to the way the Windows kernel-mode drivers handle certain exceptions. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-1894.

Mitigating Factors for Win32k Exception Handling Vulnerability - CVE-2010-1894

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:


An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k Exception Handling Vulnerability - CVE-2010-1894

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k Exception Handling Vulnerability - CVE-2010-1894

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
The Windows kernel-mode drivers do not properly handle certain exceptions.

What is the Windows kernel-mode driver (win32k.sys)?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses this vulnerability by ensuring the Windows Kernel-mode drivers handle the exception properly.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
Yes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2010-1894.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Win32k Pool Overflow Vulnerability - CVE-2010-1895

An elevation of privilege vulnerability exists because the Windows kernel-mode drivers do not properly allocate memory when making a copy from user mode. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-1895.

Mitigating Factors for Win32k Pool Overflow Vulnerability - CVE-2010-1895

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:


An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k Pool Overflow Vulnerability - CVE-2010-1895

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k Pool Overflow Vulnerability - CVE-2010-1895

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
The Windows kernel-mode drivers do not properly allocate memory when copying data from user mode.

What is the Windows kernel-mode driver (win32k.sys)?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses the vulnerability by correcting the manner in which the Windows kernel-mode drivers allocate memory.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Win32k User Input Validation Vulnerability - CVE-2010-1896

An elevation of privilege vulnerability exists in Windows kernel-mode drivers due to improper validation of input passed from user mode. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-1896.

Mitigating Factors for Win32k User Input Validation Vulnerability - CVE-2010-1896

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:


An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k User Input Validation Vulnerability - CVE-2010-1896

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k User Input Validation Vulnerability - CVE-2010-1896

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
Windows kernel-mode drivers do not properly validate input passed from user mode.

What is the Windows kernel-mode driver (win32k.sys)?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses the vulnerability by correcting the manner in which the Windows kernel-mode drivers validate input passed from user mode.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Win32k Window Creation Vulnerability - CVE-2010-1897

An elevation of privilege vulnerability exists because Windows kernel-mode drivers do not properly validate all parameters when creating a new window. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-1897.

Mitigating Factors for Win32k Window Creation Vulnerability - CVE-2010-1897

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:


An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k Window Creation Vulnerability - CVE-2010-1897

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k Window Creation Vulnerability - CVE-2010-1897

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
The Windows kernel-mode drivers do not properly validate pseudo handles within callback parameters when creating a new window.

What is the Windows kernel-mode driver (win32k.sys)?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses this vulnerability by correcting the manner in which Windows kernel-mode drivers validate pseudo handles in callback parameters when creating a new window.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.

Other Information
Acknowledgments

Microsoft thanks the following for working with us to help protect customers:


Tavis Ormandy of Google Inc. for reporting the Win32k Bounds Checking Vulnerability (CVE-2010-1887)


Matthieu Suiche of MoonSols for reporting the Win32k Pool Overflow Vulnerability (CVE-2010-1895)


Matthieu Suiche of MoonSols for reporting the Win32k User Input Validation Vulnerability (CVE-2010-1896)


Matthieu Suiche of MoonSols for working with us on the defense-in-depth changes addressed in this bulletin


Nicolás Economou of Core Security Technologies for reporting the Win32k Window Creation Vulnerability (CVE-2010-1897)

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please visit the active protections Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support


Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. For more information about available support options, see Microsoft Help and Support.


International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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Revisions


V1.0 (August 10, 2010): Bulletin published.

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